Posted by billgurley | Aug 26, 2019 @ 01:03 PM | 2,020 Views
Does anyone know where I can find an instruction Manuel for a sunbird 120 . Its a balsa kit with a wing span of 71"
Posted by rclad | Aug 26, 2019 @ 12:31 PM | 2,487 Views
Aeroplayin wrote an excellent post in the Power Thread on the relationship between Amps, Torque, HP, Watts, Voltage and Kv. Good information, if you fly electric!
Posted by unboxingexp | Aug 26, 2019 @ 11:44 AM | 1,246 Views
Orlandoo Hunter build (4 min 27 sec)

Posted by borntoolate | Aug 26, 2019 @ 10:59 AM | 1,321 Views
The XB-38 was an experimental B-17 fitted with Allison liquid cooled engines. There was some concern that production of the radial engines might not meet the production demand of the War Department. There was only one XB-38 built. It did not have a long life - during flight #9, engine #3 caught fire forcing the test crew to bail out. The prototype was, of course, destroyed. The program was ended.

One of our members on RCG, Travis, 3D printed the parts necessary to convert the B-17 into the XB-38. I was lucky in that Travis - also known as - Redhood - agreed to provide me with the necessary parts. He sent me the motor mounts, back plates, hubs and spinners, as well as the remote controlled ball turret. The custom nose glass was also provided. He also modified the spinners to accept the FMS B-25 props, which I prefer to use on all of my 1875mm B-17s. Thank you, Travis for all your hard work!


...Continue Reading
Posted by corsair2014 | Aug 26, 2019 @ 10:51 AM | 946 Views
So yesterday I took the B-Wing mk.2 out for her maiden voyage, and the initial flights went well. Fairly well balanced, and CG seemed to be close. However, the 'hyperstalling' issues seen on the mk.1 continued to plague the mk.2

If you haven't ready the mk.1 blog posts, here is a summary: under high-loading maneuvers, the aircraft will bob its nose in a 'hyperstall' like attitude in which the plane stalls and recovers quickly in somewhat rapid succession. This makes the plane difficult to fly and, ultimately, a very poor low and tight FPV platform like it is supposed to be

The mk.2 doesn't exhibit hyperstall to the extent the mk.1 did (where it was basically unflyable) although it is still present and annoying. Overall however, the mk.2 with the KFm-4 wing flies much better than the KFm-2 on the mk.1. As usual, for more build details check out my 'Stories Collections' on Instagram where I log the builds and such: https://www.instagram.com/highlydistracted/




Quick maiden flight video (courtesy of my lovely wife):https://www.instagram.com/p/B1od11AnTmd/




After some quick research, it seems that hyperstalling is largely caused by a nose-heavy plane, especially on low sweep angle wings (http://www.slopesoarer.com/Plank_Set-Up.html). Before I hack up the leading edge on the B-Wing mk.2, I will do some more flight testing with the battery moved further aft and see how that effects the flight performance. According to the standard wing CG calculator (see attached image)...Continue Reading
Posted by DutchRC | Aug 26, 2019 @ 09:42 AM | 1,612 Views
Halloa people

it's been a while sinds I featured a fixed wing RC on my channel.. NOT because I'm not interested but simply because I didn't run into a new plane I was excited to try
BUT.. here it is then.. actually a plane that comes in my YT channel's colors :P

Link to the plane: Volantex SABER 920 - KIT or PNP

Volantex SABER 920 - 3D Acrobatic Aeroplane - Flight Test :) (12 min 14 sec)


Specifications
wingspan: 920 mm
length: 875 mm
weight: 1100 grams all up weight
material: EPO foam
kit type: KIT or PNP
motor: 2215 1400 kv
propellor: 9x5
ESC: 30A brushless with BEC
servo's: 4x 9 grams
receiver: mine isn't a BNF
lipo: 1800mah 3S (not included)
ailerons: yes
rudder: yes
flaps: nope
retracts: nope
lights: nope
stabeliser: nope
Posted by Mr Tim | Aug 26, 2019 @ 08:05 AM | 702 Views
One NIB, one needs board repaired/replaced.
Posted by old4570 | Aug 26, 2019 @ 07:23 AM | 1,075 Views
Quelima SQ12 on my WLToys F959 (4 min 23 sec)



Got up around 7am , loaded the car and headed out to fly .

It was cold , my hands were freezing !

Flew
1) WL Toys F959
2) Ezio
3) 450x
4) Firstar 200
5) FMS Vtail

I think the cold effected the models a little harsh .
Flight times were down , power was down . Brrrrr !

F959 .. Flies reasonably well . Not sure how effective the cam is , but a cheap cam on a cheap plane ( see video )
Ezio .. Wow the new battery was good ( 79% left when I got home and checked )
450x Looks like the 450x has become a Nonotech killer , my battery of choice Nano 260mAh 1s puffed up about 100%
Firstar 200 , flies really well . I was actually doing rolls
FMS Vtail - Down on power , that prop bites . ( Same as original Ezio ) I will have to look at a new prop for the FMS .. Might also need a new ESC if the new prop loads the motor too much . I like the way it flies , but I hate the prop . In the cold this morning , even 100% throttle felt weak . On the other hand the Ezio was flying with very little throttle .

Oh well ! Was a day out ( little wind ) . These days be few and far between .
Oh and ...... The grumpy old man was there of course ! And he walked out into the field when I was flying without warning .
And yelling something about ( dont you know the rules ? )

Being some what curious , I was wondering what rule he was implying ?

So after he finished I asked him ..

Seems he was upset some one was flying on...Continue Reading
Posted by UnknownForces RC | Aug 26, 2019 @ 05:00 AM | 698 Views
Ufrc 4wd solid rear axle truck 8s is coming !
Posted by ljones7533 | Aug 25, 2019 @ 11:58 PM | 704 Views
heres my edge 540 with a 20 dle on it will soon have the cowling mounted and i have a 3 bladed prop and spinner on the way
Posted by kopterheld | Aug 25, 2019 @ 11:40 PM | 1,403 Views

Diatone GTB339 Cube:
Banggood Coupon: AFFBG10   http://bit.ly/GtB339Cube

Very good and fast 3S 3 inch drone which is very light with the Runcam Nano 2 camera and TBS Pro32 Nano VTX

or the Diatone GTB229 Cube 8500KV 2S Version 2.5inch drone
from Banggood with Coupon: BGGTB  http://bit.ly/GtB229Cube
Very good and fast 2S 2.5 inch drone which weighs only 43 grams with a Runcam Nano 2 camera and TBS Pro32 Nano VTX

Pro:
- lighter 3 inch FPV racer
- Good Runcam Nano 2 camera
- powerfull VTX TBS Nano Pro 32 25-400mW
- very good motor 1105
- F4 Board 3-4S 12A ESC's
- external receiver such as R-XSR, CrossFire

Contra:
- Camera like Runcam Racer Nano or Foxeer Predator 4 Nano would be even better
- Video antenna only linear
- Motors a bit too fast with 5500KV for 3S battery

Video 1 - Diatone GTB339 Cube 3 inch FPV Micro Racer
Diatone GTB339 Cube 3 Zoll FPV Micro Racer (6 min 51 sec)


Suitable batteries:
BETAFPV 300mAh 3S 45C - https://amzn.to/2ZkvZS7
GNB 300mAh 3S 45C - http://bit.ly/Gnb3s80c
GNB 450MAH 2S 80C - http://bit.ly/GNB2S450mah
Tattu 450mAh 3S 75C
Banggood - http://bit.ly/Tattu450mah4S
Amazon - https://amzn.to/2XqM1W3

GNB 300mAh 3S 30C 
Banggood - http://bit.ly/Gnb300mAh3S
Amazon - https://amzn.to/2xg3kOx

Happymodel 300mAh 3S 30C 
Banggood - http://bit.ly/M7Hd300mAh
Amazon - https://amzn.to/2IQ4zdY

Turnigy Nano-Tech 300mAh 3S 45C -
HobbyKing - http://bit.ly/2AHM5YR

LiPo Pad:
URUAV PADSTAR Lipo Silicon Pad - http:...Continue Reading
Posted by ronaldopn | Aug 25, 2019 @ 07:26 PM | 983 Views
This link is actually for me to get back to this awesome post but feel free to check if you want to go deeper into power system calculations.
Warning: numbers and formulas involved, not for the faint hearted
Ronaldo
https://www.rcgroups.com/forums/show...ostcount=26895

Additional data:
An engine tries to keep a constant torque: as load goes up, rpm goes down.
An e-motor tries to keep a constant rpm: as load goes up, torque must go up, and therefore current goes up.
Posted by Blaze0021 | Aug 25, 2019 @ 07:02 PM | 1,108 Views
This is the 44th and final Test Flight of my Arrows RC F4U-4 Corsair 1100mm Warbird, modified for 4S power.

Arrows RC F4U-4 Corsair 1100mm Warbird Golden Hour 4S Test Flight #44 (5 min 36 sec)

Enjoy the lack of extra sounds other than the ambient noise, the voice of my Spektrum DX8 (G2), and the whistle of a precisely balanced 4-blade prop on 4S with the airframe whoosh of a Corsair.

I will apologize in advance as I feel like this flight was more subdued and restricted than what I normally would perform. I almost forgot how difficult it was to use the Action Cam iPhone Headmount... having the weight of an iPhone 7 strapped to your forehead and guessing what your iPhone is actually capturing during the flight while performing maneuvers can be awkward and a bit of a challenge.

The stock 40-Amp ESC has been replaced with a ZTW Mantis 65-Amp ESC with 5-Amp SBEC, and has been relocated from the tight air-restricting box that the original 40-Amp ESC was originally placed within the nose, to the interior compartment for increased air circulation. The original ESC "box" location has been left open for adequate ventilation to the interior compartment, with only the motor/ESC wires to channel through it. The plastic dummy radial faceplate cowl has been drilled with additional ventilation holes for increased airflow and cooling to the motor and interior compartment leading to the upgraded ESC.

The stock 11.5x8 4-blade prop has been replaced with a...Continue Reading
Posted by alex_nikiforov | Aug 25, 2019 @ 01:38 PM | 1,618 Views
Eachine TX805S - 1600mW? Banggood (4 min 51 sec)


Pros
+ convenient form factor
+ cooling radiator
+ stable at 25mW
+ smart audio
+ pit mode


Cons
- low power values from declared
- very hot at maximum power

Links:
Eachine TX805S http://bit.ly/2NxcMGA
Eachine TX805 http://bit.ly/2HqkLSd
ImmersionRC RF Power Meter v2 http://bit.ly/2HoMZwD
Posted by unboxingexp | Aug 25, 2019 @ 11:56 AM | 945 Views
Posted by fastmax | Aug 25, 2019 @ 09:35 AM | 2,468 Views
Let the new build begin. I hear the Eachine Tyro machines are a pretty good value in a 5 inch kit, so figured I'd build one and see for myself.

They spec out fairly nicely, and at the Tyro109's current price of $109 in the USA warehouse if it performs half decent it'll be hard to beat for a budget 5 inch quad.

Package Includes:
1 x 210mm frame kit
2 x 2206 2400KV brushless motor CW
2 x 2206 2400KV brushless motor CCW
1 x 4 IN 1 30A BLHeli_S ESC
1 x Customized F4 flight controller
1 x Caddx Turbo Eos2 1200tvl
1 x XF5804 5.8G 40CH 0mw/25mw/200mw/600mw switchable VTX
2 x Battery strap
1x Antenna
2x 5040 four-blade propeller CW
2 x 5040 four-blade propeller CCW

Will post updates as the build progresses.

EDIT-8/26/2019

Made some progress today. Frame went together perfectly.

EDIT-8/31/2019

Build is complete. Flight video coming soon.

EDIT-10/27/2019

I wasn't a big fan of the flight characteristics of the Tyro109 frame. It is just a little too "floaty" for my liking, and flying style. Decided to move all of the components over to a GEPRC GEP-VX5 frame. Hoping to get in a maiden this afternoon. Flight video coming as soon as weather permits....Continue Reading
Posted by JimboPilotFL | Aug 25, 2019 @ 09:07 AM | 897 Views
I have published a couple of build logs on RCG and if you would like to see them they are here.

Great Planes Trainer .60 - aka Maule Sport.
https://www.rcgroups.com/forums/show...ified-Finished

Top Flite Cessna 182 kit build.
https://www.rcgroups.com/forums/show...g#post41687419

I also have a YouTube Channel with many hat cam videos and a few onboard flights.
https://www.youtube.com/channel/UCQp..._as=subscriber